箱包炸弹内爆作用下单层球面网壳结构的动力响应分析

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 290-297.

论文

李丹 1, 2 ，骆志远1，夏芊文1，邓勇军 1, 2

作者信息 +

Dynamic response analysis of single-layer spherical reticulated shell structure under internal explosion of suitcase bomb

LI Dan1,2, LUO Zhiyuan1, XIA Qianwen1, DENG Yongjun1, 2

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文章历史 +

摘要

运用ANSYS/LS-DYNA建立跨度40m凯威特K8单层球面网壳，采用流固耦合算法，考虑箱包炸弹在网壳内部爆炸的最不利类型，获取其动力响应规律。研究结果表明：在不同炸点水平位置下，网壳内部流场分布特征、冲击波传播路径以及冲击波与网壳作用过程存在差异，各特征响应随炸点水平位置的改变变化较大，网壳杆件塑性应变百分率大致在网壳半跨的3/4处达到极值；环杆塑性应变百分率较斜杆以及肋杆高，环杆轴向应力呈现的高频率、高幅值的“环杆效应”特征与环杆所处的位置有关，且主要位于网壳的倒数1~3环区域；由于冲击波的局部增强效应，内爆荷载作用下网壳结构的易损薄弱部位主要有柱脚、支座附近杆件以及网壳环杆3部分。

Abstract

Using ANSYS/LS-DYNA to establish a 40m Kiewitt K8 single-layer spherical reticulated shell, using the fluid-structure coupling algorithm, considering the most unfavorable intenal explosion type of reticulated shell and obtaining its dynamic response law. The results show that there are differences in the distribution of the flow field inside the shell, the propagation path of the shock wave, and the interaction process between the shock wave and the reticulated shell. in the horizontal position of different blasting points, therefore, the characteristic response varies greatly with the change of the horizontal position of the blast point, and the plastic strain percentage of the shell member reaches an extreme at approximately 3/4 of the half shell of the lattice shell;The plastic strain percentage of the ring rod is larger that of diagonal rod and ribs rod , The "ring rod effect" features with high frequency and high amplitude on the axial stress of the ring rod is related to the location , and is mainly located in the reciprocal 1-3 ring region of the reticulated shell; Under the explosion load, due to the local enhancement effect of the shock wave, the vulnerable parts of the shell structure mainly include the column foot, the rod member near the support, and the ring part of the net shell.

导出引用

李丹 1, 2,骆志远1，夏芊文1，邓勇军 1, 2. 箱包炸弹内爆作用下单层球面网壳结构的动力响应分析[J]. 振动与冲击, 2021, 40(5): 290-297

LI Dan1,2, LUO Zhiyuan1, XIA Qianwen1, DENG Yongjun1, 2. Dynamic response analysis of single-layer spherical reticulated shell structure under internal explosion of suitcase bomb[J]. Journal of Vibration and Shock, 2021, 40(5): 290-297

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